#include <bits/stdc++.h>
using namespace std;

int main()
{
	int a, b, h = 0;
	cin >> a >> b;
	for (int i = a;i <= b;i++)
	{
		int n = i, s = 0;
		while(n)
		{
			s ++;
			n /= 10;
		}
		cout << s;
		int c = i, z = 0;
		for (int i = 0;i <= c - 1;i++)
		{
			for (int j = 0;j <= s - 1;i ++)
			{
				if (c % 10 == j)
				{
					z ++;
				}
			}
			c /= 10;
		}
		if (z == s) h ++;
	}
	cout << h;                        
	return 0;
}